P4116 Item reclassification ¿What is the purpose of the field RFLN Related from line no?

Hi all

I hope someone can help me.

I am trying to reclassify some lots with diferent item numbers to a new lot but keeping up the same initial item number.

Example

From:  Item A Lot 001 Qty 50

           Item B Lot 002 Qty 50

           Item C Lot 003 Qty 20

To:   :  Item A Lot 004 Qty 50

           Item B Lot 004 Qty 50

           Item C Lot 004 Qty 20

I want to know ¿What is the purpose of the field RFLN Related from line no. and how to use it at the "To lines"?¿ what value should I use on each line?

Regards